Hey guys,
i built myself a passive monitor switcher with 3 possible sources and 3 outputs as well as 5 controls.
For the moment i only connected 1 channel (R+L) to test the circuit but i have a problem: the balance of the panorama is off by 30 degrees. I used bx_control and a mono signal to measure how much i need to turn until it is completely in the center again.
Apart from that all the controls work fine. I checked the wiring and the resistors to be sure i haven't overlooked anything. Also replaced the pot with a resistor and jumped the monitoring switch but nothing really helped solving this issue.. i just don't get how a simple circuit like this gives me such a problem ???
1. 4 pole 3 pos rotary selecting the signal source A / B / C
2. 4 pole 3 pos rotary selecting between -15dB dim / normal operation / mute
3. dual gang potentiometer 4k7 log scale to control the output volume (i am probably gonna replace this later on with a stepped attenuator)
4. 4 pole 3 pos rotary to switch between mono listening, stereo listening (normal) and sides only (wired as mono rev phase, schematic below)
5. 4 pole 3 pos rotary selecting the speaker A / B / C
Here is the wiring scheme i used:
I modified the attached version by some elements (mentioned above)
i built myself a passive monitor switcher with 3 possible sources and 3 outputs as well as 5 controls.
For the moment i only connected 1 channel (R+L) to test the circuit but i have a problem: the balance of the panorama is off by 30 degrees. I used bx_control and a mono signal to measure how much i need to turn until it is completely in the center again.
Apart from that all the controls work fine. I checked the wiring and the resistors to be sure i haven't overlooked anything. Also replaced the pot with a resistor and jumped the monitoring switch but nothing really helped solving this issue.. i just don't get how a simple circuit like this gives me such a problem ???
1. 4 pole 3 pos rotary selecting the signal source A / B / C
2. 4 pole 3 pos rotary selecting between -15dB dim / normal operation / mute
3. dual gang potentiometer 4k7 log scale to control the output volume (i am probably gonna replace this later on with a stepped attenuator)
4. 4 pole 3 pos rotary to switch between mono listening, stereo listening (normal) and sides only (wired as mono rev phase, schematic below)
5. 4 pole 3 pos rotary selecting the speaker A / B / C
Here is the wiring scheme i used:
I modified the attached version by some elements (mentioned above)